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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312ef4a7755a818ac802cb7baac1238ab7c8c047d9ef626933cc87971c9f5fc0' 
  AND token = 'ekevg3T9aFdExy5VIPn8on+/4Mmvr+Qi+TDUjmxnxZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}